* {padding:0px;margin:0px;}
    .box {width:500px;height:180px;overflow: hidden; position: relative;}
    ul {
        list-style:none;
        position: absolute;
        bottom: 10px;
        left: 50%;
        margin-left: -60px;
    }
    ul li {
        float: left;
        width: 10px;
        height:10px;
        background: #fff;
        border-radius: 50%;
        margin-right: 10px;
    }
    ul li.active {background: blue;}